One of the prominent feature of bitcoin is it ability to hide the identity of it users and that is why it is term decentralized which never need the involvement of any third party. And I think it will remain like that even in the future.
Yeah hopefully Bitcoin's high security will remain in future. We can use Bitcoin without losing our private information and by this we don't need to worry about our transactions history. I just want to say that bitcoin with a decentralized system is the most efficient system. If talking about an increase in the secret blockchain system, I think it will go hand in hand with the development of time and technology in the future. 
Decentralize system is very effective system for cryptocurrency. I'm very surprise to know that Bitcoin is not a decentralized crypto system. But I will be very glad if they update it in future 
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